• The reactive distortion power is the reactive power of all harmonics and is calculated using Fourier analysis (FFT).
• The apparent power S contains the fundamental oscillation und all harmonics up to the Mth harmonic.
• The active power P contains the fundamental oscillation und all harmonics up to the Mth harmonic.
• M = 40 (UMG 604, UMG 508, UMG 96RM)
• M = 63 (UMG 605, UMG 511)

THD (Total Harmonic Distortion) refers to the distortion factor. It indicates the relationship of the harmonic components of an oscillation to the fundamental oscillation.

• Cos phi sign:
  • - = for delivery of active power
  • + = for consumption of active power

The ripple control signal U is a voltage (200ms measured value) measured at a carrier frequency specified by the user. Only frequencies below 3kHz are considered.

• Sign Q = +1 for phi in Area 0... 180 ° (inductive)
• Sign Q = -1 for phi in Area 180... 360 ° (capacitive)

• The size of the voltage or current imbalance in a three-phase system is identified by the positive sequence, negative sequence, and zero sequence components.
• The symmetry of three-phase systems that is desirable during normal operation is disturbed by unbalanced loads, faults and equipment.
• Symmetry in a three-phase system is said to be present when the three phase conductor voltages and currents are equal and 120° out of phase with each other. Unbalance occurs when one or both conditions are not met. A simplified analysis of an unbalanced fault in a three-phase system is possible by calculating the symmetrical components, which are comprised of positive sequence, negative sequence, and zero sequence components.
• Unbalance is a characteristic of the power quality, for which limit values have been set according to international standards (e.g. EN 50160).